from functools import reduce
yes = []
no  = []
for _ in range(int(input())):
    *x, r = input().split()
    x = set(x)
    if r == 'YES':
        yes.append(x)
    else:
        no.append(x)
if yes:
    ans = reduce(lambda x, y: x & y, yes)
else:
    ans = {str(i) for i in range(10)}
for s in no:
    ans -= s
print(*ans)